A 800 turn coil of effective area 0.05 $m^{2}$ is kept perpendicular to a magnetic field $5 \times 10^{- 5} T$ . When the plane of the coil is rotated by 90 $°$ around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

1. 0.02V

2. 2 V

3. 0.2 V

4. $2 \times 10^{- 3} V$

Subtopic: Faraday's Law & Lenz Law |

68%

From NCERT

NEET - 2019

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Q11:

A cycle wheel of radius 0.5 m is rotated with a constant angular velocity of 10 rad/s in a region of a magnetic field of 0.1 T which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is:

(1) 0.25 V

(2) 0.125 V

(3) 0.5 V

(4) zero

Subtopic: Motional emf |

65%

From NCERT

NEET - 2019

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Q12:

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mms^-1. The induced emf when the radius is 2 cm is:

1. 2 $π μ$ V

2. $π μ$ V

3. $\frac{π}{2} μ V$

4. 2 $μ$ V

Subtopic: Faraday's Law & Lenz Law |

74%

AIPMT - 2010

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Q13:

An electron moves on a straight-line path XY as shown. The abcd is a coil adjacent to the path of electrons. What will be the direction of current if any, induced in the coil?
,

1. abcd

2. adcb

3. The current will reverse its direction as the electron goes past the coil

4. No current included

Subtopic: Faraday's Law & Lenz Law |

69%

From NCERT

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Q14:

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ= $ϕ_{0}$ +4t, where ϕ is in weber, t is time in second and ϕ₀is a constant, the output voltage across the secondary coil is:

1. 90 V

2. 120 V

3. 220 V

4. 30 V

Subtopic: Magnetic Flux |

86%

From NCERT

AIPMT - 2007

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Q15:

A conducting square frame of side 'a' and a long straight wire carrying current I are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity 'v'. The emf induced in the frame will be proportional to:

1.

\frac{1}{x^{2}}

2.

\frac{1}{{(2 x - a)}^{2}}

3.

\frac{1}{{(2 x + a)}^{2}}

4.

\frac{1}{(2 x - a) (2 x + a)}

Subtopic: Motional emf |

72%

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Q16:

A uniform magnetic field is restricted within a region of radius r. The magnetic field changes with time at a rate $\frac{d B}{d t}$ . Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of the magnetic field as shown in the figure. Then, the emf generated is:

1. Zero in loop 1 and zero loop 2

2. $- \frac{d B}{d t} π r^{2}$ in loop 1 and zero in loop 2

3. $- \frac{d B}{d t} π R^{2}$ in loop 1 and zero in loop 2

4. Zero in loop 1 and not defined in loop 2

Subtopic: Faraday's Law & Lenz Law |

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Q17:

A long solenoid has 1000 turns. When a current of 4A flows through it, the magnetic flux linked with each turn of the solenoid is 4 x 10^-3Wb. The self-inductance of the solenoid is:

1. 3H

2. 2H

3. 1H

4. 4H

Subtopic: Self - Inductance |

83%

From NCERT

NEET - 2016

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Q18:

The current (I) in the inductance is varying with time according to the plot shown in figure.

Which one of the following is the correct variation of voltage with time in the coil?

1.